Zero'es in mbox on lines with date?

[Guy Harris]

> I noticed that some of the lines in my mbox file, saved by
> the "s file" cmd of the S5 /bin/mail program puts binary
> zeros in the text file, nearby the time field, as follows
> (only the zero's changed to \000 for clarity):
> 
> Received: by teddy.LOCAL on Thu, 9 Jan 86 17:08:48 \000\000\000est
> 	id AA28338; Thu\000\000\000, 9 Jan 86 19:08:02 pst
> In-Reply-To: <894 at rlgvax.UU\000\000\000CP>
> 	id AA16280; Wed, 8 \000\000\000Jan 86 08:33:18 pst
> 
> Comments why?

How do you know that it's /bin/mail that did it?  Do you know that it didn't
come in that way?  (Besides, it's not the S5 /bin/mail, it's the result of
adding some S5 stuff to the 4.2BSD /bin/mail; why not use the 4.2BSD "mail"
command instead?)

	Guy Harris